执行jar命令行时没有发现类错误

我试图执行一个JAR，它具有在JAR lib文件夹下复制的所有依赖关系。但是当我尝试执行JAR命令行我得到以下错误执行jar命令行时没有发现类错误

at com.abc<clinit>(abc.java:33)Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger 
     at java.net.URLClassLoader$1.run(URLClassLoader.java:366) 
     at java.net.URLClassLoader$1.run(URLClassLoader.java:355) 
     at java.security.AccessController.doPrivileged(Native Method) 
     at java.net.URLClassLoader.findClass(URLClassLoader.java:354) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

这里是我的JAR结构：

abc.jar ---的lib \所有依赖库 --- COM \ ABC --- META-INF

，这里是我的pom.xml

<artifactId>maven-jar-plugin</artifactId> 
     <version>2.4</version> 
     <configuration> 
      <archive> 
      <manifest> 
       <addClasspath>true</addClasspath> 
       <useUniqueVersions>false</useUniqueVersions> 
       <mainClass>com.main.class</mainClass> 
       <classpathPrefix>./lib/</classpathPrefix> 
      </manifest> 
      </archive> 
     </configuration> 
     </plugin> 
      <plugin> 
      <artifactId>maven-dependency-plugin</artifactId> 
      <executions> 
       <execution> 
       <phase>prepare-package</phase> 
       <goals> 
        <goal>copy-dependencies</goal> 
       </goals> 
       <configuration> 
        <outputDirectory>${project.build.directory}/classes/lib</outputDirectory> 
       </configuration> 
       </execution> 
      </executions> 
      </plugin> 
     </plugins> 
    </build>

来源

2016-11-23 Sankara Sarma